This question deals with my didn't Cobb take his children when he first had to run (there are various reasons as to why this would not be feasilble)

Mine asks why, when established in a foreign country, he went through the movie's elaborate scheme rather than flying his children out to be with him.

He fled the country to where there was no extradition treaty, so he was safe and he created the elaborate scheme to get back into the US to be with his children - why did he not simply escape when he had the chance, and later contact Miles to take the children on a 'visit to Europe' and arrange a handover in some remote place away from prying eyes?